Hello and welcome.
Do one or the other if you're going to build more than a pair eventually, ie either the Otop 12 or the DR250.
Not both. They don't play nicely together because they have different phase response.
Toms got the dispersion covered, but yes, 120 degrees for the melded array, about 100 degrees for the flat array or the CD horn...
2 x DR 250 (melded array) with March 2012 plans.
4 x 20" BP102 T39's
3 x WH8 with melded array.Bunter's Audio and Lighting
"like"s would be most appreciated...